A right tributary of the Dronne, the Ruisseau de Lachenaud, forms the western continuation of the northern boundary to Champs-Romain.

Near the center of Saint-Pardoux the Dronne receives a left tributary, the Ruisseau de Chantres.

The topographically lowest point in the commune with 132 meters above sea level is situated at the southern exit of the Dronne near Jamaye, the highest point with 332 meters above sea level near Bos Brûlat in the very northeastern corner.

To the north and east of these faults one encounters the Variscan basement rocks of the northwestern Massif Central, which also stand out topographically.

The flat-lying sediments surrounding the village center are mainly of Jurassic age and comprise Lias as well as Dogger limestones.

Close to the border faults crop out the so-called sidérolithique (iron-rich, reddish, clayey sands) and solidified, conglomeratic alluvial deposits.

Limestone debris mantelling certain hill slopes is due to gelifraction processes during the last ice age.

Worth mentioning are certain mineral occurrences like silver-bearing galena in the paragneisses or baryte mainly within the Lias.

The Neuil mine, situated in the paragneisses, contains apart from galena and baryte the minerals chalcopyrite, gypsum, marcasite, pyrite, pyromorphite and sphalerite.